I just tried my new Quadro 4000 for Mac on the Windows 7 side. I tried a render in Maya 2013 and actually, to be honest, I didn't even saw a difference than what my previous GeForce GT 120 did.. In fact, while just browsing around I don't see any difference (Though on the Mac side, open pages on internet seemed faster since I installed the Quadro 4000..) So yea, any reason you can see why it doesn't seems to have a difference? I actually downloaded the lastest drivers on the Windows side, but nothing seems to change on the performance side. EDIT: Alright, I just tried both cards. I made the EXACT SAME RENDER with the Quadro 4000 and the GeForce GT 120, and both did the render in 25 seconds.. I guess there is a problem here, I can't beleive I paid $800+ for nothing better.